Teratorn Aircraft, Inc. (named for the extinct ice age soaring bird) was an American aircraft manufacturer based in Clear Lake, Iowa.

The company specialized in the design and manufacture of ultralight aircraft in the form of kits for amateur construction and ready-to-fly aircraft under the US FAR 103 Ultralight Vehicles rules.

[1][2][3] The company was formed as Motorized Gliders of Iowa, Inc. in 1976 and located in a 50,000 sq ft (4,600 m2) production facility.

[1][3] After Teratorn went out of business in about 1989, Golden Circle Air of De Soto, Iowa took up production of Terratorn's designs.

[4][5][6][7][8][9][10][11] Golden Circle Air went out of business in circa 2006, the designs were acquired by Bret Kivell's Indy Aircraft and put back into production from 2011 to 2021.